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Forest production dynamics along a wood density spectrum in eastern US forests

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Abstract

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Emerging plant economics spectrum theories were confirmed across temperate forest systems of the eastern US where the use of a forest stand’s mean wood density elucidated forest volume and biomass production dynamics integrating aspects of climate, tree mortality/growth, and rates of site occupancy.

Abstract

As a tree’s functional trait of wood density has been used to refine models of tree competition, it may also aid in evaluating hypotheses of forest production such as declining growth and mortality across a spectrum of increasing wood density. The goal of this study was to examine trends in aboveground live tree production as related to mean wood density using a region-wide repeated forest inventory across eastern US forests. Using quantile regression, the 90th percentile of volume and biomass accretion was negatively related to the mean wood density of a stand’s constituent tree species. This relationship was strongest on forest sites with the highest number of growing season degree days, as growing season length influences the rates of stand development. For these sites, variations in volume and biomass accretion were most pronounced in stands with low mean tree wood density, which also demonstrated the highest rates of site occupancy and mortality. This study confirmed aspects of the emerging theory of “fast–slow” plant economics spectrums across temperate forest ecosystems. Stands with relatively low wood density appear to occupy sites more rapidly leading to a concomitantly higher rate of tree mortality, but with less biomass accretion relative to volume due to allocating biomass or carbon to a greater tree volume. In contrast, stands with higher wood density exhibited slower site occupancy due to high wood density construction costs, but with increased biomass relative to volume accretion. These findings highlight the potential application of the plant economics spectrum theory in refining our understanding of general patterns of forest stand production, the role of plant traits in forest management, and knowledge gaps such a shifts in tree allometry during stand development.

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Author contribution statement

CWW, MBR, and SSS: developed research hypotheses; CWW, MBR, and BFW: conducted all analyses; All authors contributed to interpretation of results, writing, and edits.

Acknowledgments

This study was funded in part by a NASA Carbon Monitoring Systems (NNH11ZDA001N-CMS) grant.

Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to C. W. Woodall.

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Communicated by G. Piovesan.

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Woodall, C.W., Russell, M.B., Walters, B.F. et al. Forest production dynamics along a wood density spectrum in eastern US forests. Trees 29, 299–310 (2015). https://doi.org/10.1007/s00468-014-1083-1

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  • DOI: https://doi.org/10.1007/s00468-014-1083-1

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